LSP ping and traceroute for bypass tunnels

Active Publication Date: 2011-05-03
JUMIPER NETWORKS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]A network device may include a control unit to assemble MPLS echo requests, each of the echo requests including an instruction for a separate transit node in a functional LSP to send the echo request via a bypass path associated with the transit node and an instruction for an egress node to send an echo reply that indicates that the echo request was received via the bypass path. The device may also include an output port to send the echo requests over the LSP.

Problems solved by technology

These failure mechanisms may construct a bypass tunnel across a protected link / node.

Method used

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  • LSP ping and traceroute for bypass tunnels
  • LSP ping and traceroute for bypass tunnels
  • LSP ping and traceroute for bypass tunnels

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Embodiment Construction

[0020]The following detailed description refers to the accompanying drawings. The same reference numbers in different drawings may identify the same or similar elements. Also, the following detailed description does not limit the invention.

[0021]Systems and methods described herein may use label switched path (LSP) ping and LSP trace mechanisms for evaluating bypass paths, such as resource reservation protocol (RSVP) tunnels, for an LSP in a multiprotocol label switching (MPLS) network. Each bypass path may provide a failure mechanism across a protected link and / or node in the LSP. Generally, the bypass path will be used only in case of failure of the protected link and / or node. Thus, in a normal LSP scenario, there is no way for the ingress of an LSP to know if the bypass paths are working prior to a failure in the LSP. The systems and methods described herein may assemble MPLS echo request that instructs a transit node to send the echo request via a bypass path associated with the...

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Abstract

A method performed by a network device may include assembling a multiprotocol label switching (MPLS) echo request, the echo request including an instruction for a transit node to forward the echo request via a bypass path associated with the transit node, and an instruction for an egress node to send an echo reply indicating that the echo request was received on the bypass path. The method may also include sending the MPLS echo request over a functioning label switched path (LSP).

Description

BACKGROUND[0001]In a multiprotocol label switching (MPLS) network, a signaling protocol may be used to set up a label switched path (LSP) in the MPLS network. MPLS may permit a network to direct a flow of packets along a predetermined path (e.g., a LSP) across the network. As part of setting up the LSP, label switching routers (LSRs) included in the MPLS network may set up a label information base (LIB) that maps an incoming label from an input port of the LSR to an output port of the LSR and to a new label value. The LSRs may forward packets along links through the MPLS network based on labels attached to the packets that indicate which LSP to use. The label may be swapped to the new label at each router hop. In this way, a LSP may identify the specific path of nodes (e.g., routers) and links that the packets take through the MPLS network.[0002]Resource reservation protocol (RSVP) may be used to reserve resources across a network. RSVP may be used by either a host or a router to re...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06F15/173H04L12/28H04L45/24H04L45/28H04L45/50
CPCH04L45/22H04L43/0811H04L45/50H04L45/28H04L43/10
Inventor KOMPELLA, KIREETIBAHADUR, NITIN
Owner JUMIPER NETWORKS INC
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